CVE-2017-1000102 in Jenkins
Summary
by MITRE
The Details view of some Static Analysis Utilities based plugins, was vulnerable to a persisted cross-site scripting vulnerability: Malicious users able to influence the input to these plugins, for example the console output which is parsed to extract build warnings (Warnings Plugin), could insert arbitrary HTML into this view.
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Analysis
by VulDB Data Team • 01/15/2021
The vulnerability identified as CVE-2017-1000102 represents a critical persisted cross-site scripting flaw within static analysis utilities plugins, specifically affecting the Details view functionality. This vulnerability manifests in environments where Jenkins and similar continuous integration platforms utilize plugins that parse console output to extract build warnings and other diagnostic information. The flaw enables malicious actors to inject arbitrary HTML code into the plugin's Details view, creating a persistent security risk that can affect all users who access the vulnerable interface. The vulnerability stems from inadequate input sanitization and output encoding mechanisms within the plugin's rendering process, allowing attacker-controlled data to be interpreted as executable HTML content rather than plain text.
The technical exploitation of this vulnerability occurs through the manipulation of console output data that these plugins process to generate build warnings and other diagnostic information. When the Warnings Plugin or similar static analysis utilities parse console output containing malicious HTML tags, the vulnerable code fails to properly escape or sanitize the input before displaying it in the Details view. This allows attackers to inject script tags, iframe elements, or other HTML constructs that execute in the context of authenticated users' browsers. The persistence aspect of this vulnerability means that the malicious code remains active in the system until manually removed, potentially affecting multiple users who access the affected plugin interface over time. This represents a CWE-79 (Cross-site Scripting) vulnerability classified as persistent due to the stored nature of the malicious input within the plugin's data processing pipeline.
The operational impact of CVE-2017-1000102 extends beyond simple data corruption or display issues, as it creates a potential vector for more sophisticated attacks within the CI/CD environment. An attacker who successfully exploits this vulnerability could execute arbitrary JavaScript code in the browser context of authenticated users, potentially leading to session hijacking, privilege escalation, or data exfiltration from the Jenkins environment. The vulnerability is particularly concerning in enterprise settings where Jenkins servers often contain sensitive build artifacts, credentials, and access controls that could be leveraged by attackers. Additionally, the attack surface is amplified when considering that Jenkins environments frequently integrate with other systems through plugins, making the exploitation of this vulnerability potentially impactful across the entire software development lifecycle infrastructure. This vulnerability aligns with ATT&CK technique T1059.007 (Command and Scripting Interpreter: JavaScript) and could enable further lateral movement within the development environment.
Mitigation strategies for CVE-2017-1000102 should focus on immediate patching of affected plugins and implementation of robust input validation measures. Organizations should prioritize updating all affected Jenkins plugins to versions that properly sanitize user input and encode output before rendering in the Details view. The recommended approach includes implementing proper HTML escaping mechanisms in the plugin code to prevent malicious content from being interpreted as executable code. Additionally, administrators should consider implementing Content Security Policy headers to limit the execution of inline scripts and other potentially dangerous content within the Jenkins interface. Network-level mitigations such as web application firewalls and regular security scanning can provide additional layers of protection. Organizations should also implement strict access controls and monitoring for Jenkins environments, particularly focusing on unusual console output patterns that might indicate exploitation attempts. The vulnerability underscores the importance of input validation and output encoding practices in web applications, particularly within development environments where trust relationships between components can be exploited by attackers. Regular security assessments and penetration testing of CI/CD environments are essential to identify similar vulnerabilities in other plugins and components that may not have been explicitly addressed in the original vulnerability disclosure.